Relay for telephone-lines.



No. 650,9!5. Patented lune 5, |900. C. E. SCBIBNER & F. B. McBEBTY.

RELAY FUR TELEPHDNE LINES.

(Appumion mad nb. 14, 189e.) N o M o d e I IIN Fig

Fig

Witnesses:

UNITED STATES PATENT. OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, AND'FRANK R. MCBERTY, OF

DO'WNERS GROVE, ILLINOIS, ASSIGNORS TO THE IVES'IERN ELEC- i TRIC COMPANY Ol" CHICAGO, ILLINOIS. i

vrai-:treff r'oaTELEPHoNE-LINES.

SPECIFICATION forming part f Letter. Patent N o. 650,915, ydated June 5, 1900.

' Application led February 14, 1898. Serial No. 670.243. (No model.)

Ib au whom it may concern:

Ile it known that we, CHARLES E. SCRIBNER, a citizen of the United States, residing at Chicago, in the county of Cook, and FRANK R.

' MCBERTY, residing at Downer-s Grove, in the county of'Du Page, State'of Illinois,have in- -V vented a certain now'and useful Im rove y lol inentin Relays for Telephone-Lines, Cases Nos.'457 and 464,) of -which the following is a full, clear, concise, and exact description. Our invention relates tothe construction of relays for use in telephone-lines or in association therewith to control secondary signals or other appliances in connection with the lines. It consists in details of structure whereby great simplicity and cheapness of construction together with extreme sensitivencss are obtained.

The appliance is illustrated in the attached drawings, of which- Figure 1 is a side elevation' of the relay, its cover, which is designed for protection from dust and as ashieldagainst electromagnetic induction, being shown in section. Fig. 2 is an end elevation of the relay. Fig. 3 isa view of the opposite end of the same. Figa 4 is a longitudinal central section.

The magnet-spool of the relay consists of a core a, on `which two heads c' a?, of hard rubber or other suitable insulating material, are forced, the space between the heads being wound with wire in the usual way. The terlninals of the winding of wire are soldered to terminal extensions a3 a, which are small tubes of metal secured at opposite points in the head a', the extremities of the wire being led through small holes in the head and wound around the terminals. This core is provided with an extended pole-piece b, bent at a right angle and having one limb lying parallel with the core, secured by means ot its shorter limb to the core a. The longer limb is provided with a transverse notch b', the vertex of which is approximately in the plane of the free pole of core a. The armature c of the magnet is shaped to an edge at its lower end, which' edge rests in the V-shapcd channel b. Lateral movement of the armature is prevented terminal forthe contact-anvil.

Aby a small pin b2, which projects through they ture c. The armature is perforated at a point opposite the center ot the core a. Through this perforation a stud a, of brass or other suitable non magnetic material, projects freely, being securely screwed into the corel This stud', which is threaded, carries a nut a6 outside the armature, which serves to lim-it the movement of armature c. The nut has a short thin sleeve which is slit and compressed upon th stud in .order that the nut may move with'fric-tion. duced in breadth toward its upper extremity, and near its end carries an adjustable contact-screw c. This contact-screw isprov-ided with a forward contact-an vil, consisting of a vstrip d, formed bypunchin g from sheet metal.

One end of this strip is led parallel with the core a through suitable openings to the rear of the magnet, where it serves as asoldering A portion of the strip lies against the head a* of the magnet and is secured thereto by a screw d'. This strip carries a contacbaovil d2, preferably of platinum, .opposite the contact-screw o2.

The relay is supported ou a disk e. .The means for securing the disk, core, and polepiece together consists of a threaded stud f, passing through openings in the pole-piece b and the disk e and into core a and carrying a nut which when screwed into plaqe binds the core, the pole-piece, and the plate e together.-

This uut lies in the countersun'k opening in the plate c. The stud fextends beyond the nut for a purpose tobe presently described. The plate e is provided with openings e, e2,

and el, which are hushed with hard rubber or other insulating material, through which pass n the terminals a3, a4, and d, respectively. The/ plate also carries aterminal-stud e,which ,1s

screwed into it and furnishes means for counecting with the frame ot' the relay/ The periphery of the disk e is threaded to engage an interior thread of a tubular cover g for the relay. This is preferably made of copper, closed at the ,forwardfend ts thickness The armature is reshould be such that the relay when placed in telephonie circuit may be perfectly protected from electromagnetic induction from neighboringcireuits, three thirty-seconds of an inch being commonly sufficient for this purpose.

Itis customary to mount a number of the relays on a common supporting-plate 7L. For this purpose the stud f is passed through an opening in the plate 7L and receives a nut at the outer tace ot the plate, each relay being preferably insulated from the plate by suitable bushings and washers ot hard rubber. The terminals of the relay project freely through openings in the plate h.

This relay is designed for connection in telephone-circuits where the magnet of therelay is intended to respond to battery-currents produced in the line during the use of the telephone, the contacts of the relay controlling a local circuit containing a secondary signal or other apparatus. 'Ihe volume of the batter 1-current islimited b the carr in" capacity of various instruments in the circuit,

.including the transmitter which it supplies, 'y'

and in addition to this-,requirement it is necessary that the impedance of the relay shall be as small as possible. lt is thus essential that the relay shall `be extremely sensitive while having the minimum ampere-turns in the circuit. The vrelay herein described is especiallysensitive-in virtue of the close' niagnetic contact between lthe armature and the pole-piece at their beari 11g-surfaces, the pressure at the contact-surfaces increasing during the excitement of the relay without perceptible increase in the friction between the parts.- It will be noted that this relay can be constructed almost wholly through the exercise .of simple and rapid processes, such as turning, punching, and drilling. Thus the heads ot' the spools, the pole-piece b, the plate c, the armature c, the strap d, carrying the contactanvil, are all formed by punching and, bending, together with the openings in them. The edge of armaturenl and the channel in the pole-piece b should be milled. The assembly of the appliance is simple and cau be quickly and accurately done.

W'e claim as new and desire to secure by Letters Patent- -1. The combination 'with the core and the spool thereon, of the flat narrow extended pole-piece parallel with the core, the straight transverse channel therein, the armature placed vertically above the channel formed with an edge resting in the channel, a contact-piece carried by the armature, and a fixed contact therefor whereby a highly-sensitive relay is formed while the contacts are made certain, as described.

2. In combination, the core and thespool thereon, the extended pole-piece parallel with the core, the transverse channel therein, the armature placed vertically above the channel formed with an edge resting inthe channel, a recess in the armature, anda projection of the pole-piece entering the recess, whereby lateral niovemeutof the armature is prevented, as described.

In combination, the core and the spool thereon, the pole-piece extended parallel with the core having the transverse channel formed in it, the armature formed with an edge resting in the channel, and provided with an adj ustable contact-screw c2, the opposite anvil d2 carried upon .the strip (Z, the armature being perforated, the studcarried bythe core projecting freely through the said perforation, and the adjusting-nut on the stud for limiting the play of the armature, as described.

4. The combination with the core of the magnet and the spool thereon, the fiat narrow eXtendedpole-piece parallel with the core, and the armature resting on the pole-piece, of the plateccarried on the pole-piece of the magnet, and the closed thick tubular envelop of copper carried by the said plate, as clescrbed.

5. The combination with a tcl thone-circuit and a relay having its lnagfneinelnded in said circuit, of a'thick envelop ot good conducting non-magnetic ,materialjfsurrounding and inclosing the said rela' substantially as described. s

.6. The combination with the core and the extended pole-piece thereof, the armature resting on the pole-piece and the contactpoint Lcarried by the armatureof-thecontactstrap d having a portion bent at right angles lying against the head of the spool in position to make contact with the said contactpiece of the armature, and having an extended portion lying parallel with the core, the plate e,.the terminal-extension of said contact-strap passing through the bushed opening in the plate and being secured thereby, as described.

In witness whereof we hereunto subscribe our` names this 31st day of January, A. D. 1898.

CHARLES E. SCRIBNER. FRANK R. MCBERTY.

Witnesses:

ELLA EDLE-R, PEARLE CLENDENING.

IOS 

